On a United flight from Houston and Orlando he watched passengers as they emerged from the smaller lavatories and said: “All of them seemed really surprised.”

Fears have also been raised about the air rage stemming from the new small toilet size.

“We believe these lavatories contribute greatly to the general decline of the in-flight experience and have the potential to lead to increased incidents of air rage,” said Shane Staples, a spokesman for the Association of Professional Flight Attendants at American Airlines.